A Sudden Twist
Three Chinese astronauts named Chen Dong, Chen Zhongrui and Wang Jie were supposed to come back to Earth in early November 2025 after spending six months on the Tiangong [[space station::A large spacecraft that stays in orbit around Earth and is used by astronauts to live, work, and conduct scientific experiments.]]. Their spacecraft, called Shenzhou 20, was already checked and ready for the trip home.
Everything seemed normal, but engineers then found a problem that forced the team to delay the return for safety reasons, surprising many people worldwide.
What Went Wrong?
Before Shenzhou 20 could [[undock::To separate a spacecraft from another spacecraft or a space station after they have been joined together.]] from the space station, experts discovered a crack in one of its windows.
This happened because a tiny piece of space [[debris::Broken or leftover pieces of objects, especially damaged parts of satellites or spacecraft floating in space.]] had struck it while it was in [[orbit::The curved path that an object follows as it moves around a planet, star, or moon due to gravity.]]. Although the debris was very small, it was travelling extremely fast, hence it damaged the window.
A spacecraft returning to Earth has to pass through very strong heat and pressure during [[reentry::The process of a spacecraft coming back into Earth’s atmosphere from space.]], so a cracked window could break and put the astronauts in danger. Because of this, Shenzhou 20 was no longer safe to use.
The astronauts were safe on Tiangong, but they had lost their way to return home.
Using Another Spacecraft
Luckily, another spacecraft named Shenzhou 21 had just arrived at the space station with a new crew.
After careful planning, China decided that the Shenzhou 20 astronauts would return to Earth using Shenzhou 21 instead.
On 14 November 2025, they undocked from Tiangong, travelled through Earth’s atmosphere, and landed safely in Inner Mongolia after spending a record 204 days in space.
However, this created a new problem. The Shenzhou 21 crew now had no safe return vehicle of their own, as their spacecraft had already been used by the Shenzhou 20 crew.
The damaged Shenzhou 20 was still attached to the station, but it was not safe for landing.
How Will They Be Rescued Now?
To protect the astronauts still living on Tiangong, China quickly prepared another spacecraft called Shenzhou 22.
Instead of launching it next year, officials planned an [[uncrewed::Describing a spacecraft or mission that operates without humans on board.]] launch on 25 November 2025, which means it will be launched empty, without a crew on board.
Once this new spacecraft reaches Tiangong and docks successfully, it will become the emergency escape and return vehicle for the Shenzhou 21 crew. It may also bring extra food and supplies because the unexpected delay used resources faster than expected.
This plan will allow the current astronauts to continue their mission with confidence.
Conclusion
This incident shows that space can be unpredictable. Even a tiny object floating in orbit can damage a spacecraft and change a mission.
It also reminds us that keeping spacecraft safe from debris will be a major challenge for future space travel.
Quick revision
Three Chinese astronauts couldn’t return to Earth because a tiny piece of fast-moving space debris cracked a window on their Shenzhou 20 spacecraft, making it unsafe for reentry.
The crew safely returned on 14 November 2025 using the newly arrived Shenzhou 21.
The Shenzhou 21 crew is now without its own return vehicle, so China plans to launch an uncrewed Shenzhou 22 on 25 November 2025 to serve as their emergency ride home.
